Airframe Mechanic Certification Sheet Metal Structures 4

Question 1

When performing a repair on aircraft skin using a flush patch, the patch material must be:

Accepted Answer

The same material type and temper as the original skin

Answer

Repair patches must match the original material specification (alloy and temper) to maintain the structural and corrosion properties of the original design.

Question 2

A 'pilot hole' in sheet metal work is:

Accepted Answer

A small-diameter starter hole drilled before final-size drilling

Answer

A pilot hole is a small-diameter hole drilled first to guide the final-size drill and improve hole location accuracy.

Question 3

What does the 'T' designation (such as T3, T4, T6) indicate in aluminum alloy nomenclature?

Accepted Answer

The temper (heat treatment condition) of the alloy

Answer

The T designation indicates the temper, which describes the specific heat treatment or work-hardening process applied to achieve desired mechanical properties.

Question 4

During a sheet metal repair, when must a doubler be used in addition to the filler patch?

Accepted Answer

Whenever the damaged area exceeds the allowable limits for a simple filler patch

Answer

A doubler is required when damage exceeds the limits for a simple filler patch, providing the additional material needed to restore original structural strength.

Question 5

Fretting corrosion between sheet metal components most commonly occurs due to:

Accepted Answer

Slight relative motion between faying surfaces under vibration

Answer

Fretting corrosion is caused by microscopic relative motion between tightly fitted surfaces under vibration, which wears away protective oxide layers.

Airframe Mechanic Certification Practice Test

Airframe Mechanic Certification Practice Test

Airframe Mechanic Certification Sheet Metal Structures 4